To extract certain text from a cell in Excel, you can use various functions depending on which part of the text you want to extract:

1. LEFT function: Extracts a specified number of characters from the start (left) of a cell's text.
   Syntax: =LEFT(cell, number_of_characters)

2. RIGHT function: Extracts a specified number of characters from the end (right) of a cell's text.
   Syntax: =RIGHT(cell, number_of_characters)

3. MID function: Extracts a substring from the middle of a cell's text starting at a specified position for a specified length.
   Syntax: =MID(cell, start_position, number_of_characters)

4. FIND function: Helps find the position of a specific character or substring within the text, which can be used with LEFT, RIGHT, or MID to extract text based on the position of that character.
   Syntax: =FIND(substring, cell, [start_position])

5. Text to Columns feature: Splits text into multiple columns based on delimiters such as spaces, commas, or tabs.

6. SUBSTITUTE and FLASH FILL are more advanced methods for extracting or cleaning text based on patterns or replacing unwanted characters.

For example, to extract the first 4 characters from cell A1, use:
=LEFT(A1,4) To extract 3 characters from the 6th position in cell A1, use:
=MID(A1,6,3) To extract the substring after a specific character like "@" (e.g., for email domains), you can combine FIND with MID or RIGHT. These methods allow flexible extraction of specific text portions from any cell in Excel.